Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b9b98606c9947a…

MALICIOUS

PDF

84.2 KB Created: 2021-05-29 09:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cb52efbc5044678960957032547e092f SHA-1: 5b240b7952864e0ddc2c94b38e4534093670367c SHA-256: 34b9b98606c9947a01b2c5e7b806d2adc9bcec67c3e64a9fad75798c065f8ed8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=call+of+duty+mobile+apk+and+obb+file+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6046338f144bd.pdfIn PDF document text
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/5344ea.pdfIn PDF document text
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/e9a3de81535f80.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/zovatufejivet_wikomiba_solesajapago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5fdd930383f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_6048fa881e0d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fdecb7ea210f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_6026e83c2d2ba.pdfIn PDF document text
    • https://tokubarip.weebly.com/uploads/1/3/1/3/131380438/136edb3dfb86e.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/juliwapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_605876d83f0cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5feb568de34b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffe531705524.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/vumapafejuxame.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/289dba4ce086ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_6038467c6e99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6022c6be8d8e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7026371-b31a-4a15-9b12-ea8cb5ee779d/zitifopoporudijexozatafaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75a0ce1-edc0-47b6-8bf6-74f107e6e2ba/fire_evacuation_drill_report_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa2c805-a2a8-4e90-91f5-eb5ea096b4e9/how_fast_is_a_15_hp_outboard_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d937903-1d98-4a65-87ed-dd363bc61ea0/9101040455.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5312 bytes
SHA-256: 125841c9567abba65ca49d6b287588b5b5300ab3d1628e9779b4a18a0045bcac
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 24716 bytes
SHA-256: a13b1882a254617fbd7b732aa7f8e22f870f63ec460b43353ea3cdb10caa65a9
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71